Unable to replenish crew on ZSU 57 2

Good day,
I have been playing with my ZSU 57 2 and it seems that when I go to a point captured by my team the crew replenishment button opens up but I can’t replenish crew when I have missing crew
here is a video:


I can’t get my crew replenished at all with that tank despite have missing crew:
image
I already have that crew replenishment for my ZSU 57 2 research. Here is proof:

I really hope a fixed happens to this. I don’t know if this happened to any other ground forces, but this is what I am experiencing.
Thank you
Have a great day!