Appearance mistakes in some versions of LaTeX

.gitignore

@@ -1,4 +1,6 @@
 build/
 dist/
 .directory
+*.swp
+*~
 

presentazione.tex

@@ -88,12 +88,14 @@
         \begin{columns}
             \begin{column}{.25\textwidth}
                 \includegraphics[width=.9\linewidth]{img/trashware.png}
+
                 \centering
                 Trashware
             \end{column}
 
             \begin{column}{.25\textwidth}
                 \includegraphics[width=.9\linewidth]{img/sbc.jpeg}
+
                 \centering
                 Single board
             \end{column}
@@ -104,11 +106,13 @@
         \begin{columns}
             \begin{column}{.25\textwidth}
                 \includegraphics[width=.9\linewidth]{img/android.png}
+
                 \centering
                 Smartphone
             \end{column}
             \begin{column}{.25\textwidth}
                 \includegraphics[width=.9\linewidth]{img/arduino.jpeg}
+
                 \centering
                 Arduino
             \end{column}
@@ -124,21 +128,25 @@
         \begin{columns}
             \begin{column}{.25\textwidth}
                 \includegraphics[width=.9\linewidth]{img/gnu-linux.png}
+
                 \centering
                 GNU Linux
             \end{column}
             \begin{column}{.25\textwidth}
                 \includegraphics[width=.9\linewidth]{img/cli.png}
+
                 \centering
                 System admin
             \end{column}
             \begin{column}{.25\textwidth}
                 \includegraphics[width=.9\linewidth]{img/ddwrt.png}
+
                 \centering
                 Networking
             \end{column}
             \begin{column}{.25\textwidth}
                 \includegraphics[width=.9\linewidth]{img/nextcloud.png}
+
                 \centering
                 Decentralizzazione
             \end{column}
@@ -149,12 +157,14 @@
         \begin{columns}
             \begin{column}{.25\textwidth}
                 \includegraphics[width=.7\textwidth]{img/oss.png}
+
                 \centering
                 Software libero
                 Programmazione
             \end{column}
             \begin{column}{.25\textwidth}
                 \includegraphics[width=.9\linewidth]{img/firefox+tor.png}
+
                 \centering
                 Navigazione sicura
             \end{column}
@@ -169,21 +179,25 @@
     \begin{columns}
         \begin{column}{.25\linewidth}
             \includegraphics[width=\textwidth]{img/oi-giorno.jpeg}
+
             \centering
             $ 46 m^{2} $
         \end{column}
         \begin{column}{.25\linewidth}
             \includegraphics[width=\textwidth]{img/sala-corsi.jpg}
+
             \centering
             sala corsi
         \end{column}
         \begin{column}{.25\linewidth}
             \includegraphics[width=\textwidth]{img/trashware-ricambi.jpg}
+
             \centering
             ricambi pc
         \end{column}
         \begin{column}{.25\linewidth}
             \includegraphics[width=\textwidth]{img/postazioni-lavoro.jpg}
+
             \centering
             postazioni
         \end{column}
@@ -191,21 +205,25 @@
     \begin{columns}
         \begin{column}{.25\linewidth}
             \includegraphics[width=\textwidth]{img/stampante-3d.jpg}
+
             \centering
             stampante 3D
         \end{column}
         \begin{column}{.25\linewidth}
             \includegraphics[width=\textwidth]{img/arcieri.jpeg}
+
             \centering
             semafori
         \end{column}
         \begin{column}{.25\linewidth}
             \includegraphics[width=\textwidth]{img/obbrobrio.jpeg}
+
             \centering
             computer inusuali
         \end{column}
         \begin{column}{.25\linewidth}
             \includegraphics[width=\textwidth]{img/antenna.jpeg}
+
             \centering
             apparati di rete
         \end{column}