The problem is not necessarily a problem with the template.
Sometimes it can, but sometimes it's not.
For example, problems that aren't caused by the template occur when people upload pictures that are wider than 1000 pixels.
This makes the forum page wider, for a normal PC, it means you need to scroll to the right (or nothing happens when you have a bigger screen like most people do nowadays).
But a tablet will scale it to fit, meaning that the text is far too small.
We have rules here on our forum that state that images wider than 1000 pixels should be thumbnailed instead, and people are free to report such issues.
So even changing the forum template (if there even is one), will not fix that issue.
I will look into installing a secondary template, if they exist or not, so people are choose to switch between templates.