The VEAK 40 has a problem with its track physics. Its tracks “sticking” to the rollers, regardless of the set settings physics or the quality of the track marks.
I really hope this problem will be fixed in the soon eagle shadow update
You can bug report it here: Gaijin.net // Issues (just search a bit first so that you don’t report something that is already reported and known about)
A guide on how to report bugs can be found here: ([Navigation] Technical Knowledge Base | War Thunder Wiki)