It's funny, 'cause I reported this big internally not long ago, and attached screenshot of it, which looks exactly the one you posted. What's wrong with Arad that everybody has an urge to scroll the mouse wheel while manning a hanomag on it? (this bug was in game probably for a long time before 2.5 patch)
It was fixed by Gavrant 4 days ago, and fix will be included in the next public patch. Thanks for the report anyway