That sounds like a design flaw - or an inappropriate choice of transducer
Just the way things are .. (caveat - there may be better units available these days). Consider that design is for axial loading, as is calibration. I would need to refer the present state of play question to a colleague who designs and manufactures such animals ..
To give you an example, many years ago I was tasked with sorting out the dreadful weighing history on a fleet of GIIs. Turned out that, due to the jackpad geometry, any rotation of the hull to level accentuated lateral loading of the jacks (and load cells). Consecutive weigh cell variations could easily be in the order of several hundred kilos (might have been pounds - can't recall after nearly 30 years). When we tried locking the oleos and levelling prior to jacking ... the problems all promptly disappeared and the weigh variations were negligible. This is why some of us insist on level and locked for jackpad weighings ..