Hello Des,
one possible explanation for the behavior you described could be that, on your customer’s system, one of the involved values is NULL. In that case, calculations or formulas may evaluate differently than in your development environment.
Another possible cause may be that the column width is calculated using a formula that does not use UnitFromSCM(). If a different coordinate system is active on the customer side, this can lead to deviating results.
Could you please test whether the behavior can also be reproduced using a sample from our demo application?
If that’s not possible (or if the result is still unclear), please create a log file and upload it for further analysis - ideally via our support portal.