Uneven fuel level in tanks.

[TRUCK365]

2020 Freightliner Cascadia
Truck will consume fuel from one tank only and wont even out with second tank. In other words. If you fill one tank all the way and keep the second tank at 50% the levels will not balance out like it used to. I took it to the Freightliner dealer and they replaced the sending unit along with both vents and vent hoses. One week and $1400 later the problem persist. Anyone had this happen before? Ideas? Thoughts?

Thank you all in advance.