Fuel gage not reading 100 % full assuming tank is full

[Acreage T250]

I replaced the sender in my T250 last year with a Bobcat OEM #7286464 sender which cleared the associated error code when I purchased the skidsteer. I recall I checked the low and full by pushing the float fully up and down before installing.

I have never fully filled the tank until recently, when I noticed fuel was visible at the fuel cap, but the gage never indicated over 3/4 full.

I removed the sender today and pushed the float to the top and the gage read 100% full and the float had no signs of fuel in it. What gives?

 

[Acreage T250]

I decided to replace the OEM sender with an aftermarket one from All Skidsteer (bottom in pic) and now I get a full indication on the fuel gage with a confirmed full tank. Amazing the 3x cost OEM sender doesn't work as well as an aftermarket one, but time will tell if this aftermarket sender lasts.