When I open a certain design file model and modify the member points, either the member display goes back to normal size or it becomes large. It is not consistent. Tfinfo on the member still reports the correct section size though.
Using working units resolution other than or close to the delivered Imperial 304800 per foot has caused issues when modifying any elements, not only with structural members but walls or solids too. The fact that it is inconsistent is consistent of the problem with low design file resolution accuracy in a model. Usually something like this will or will not happen at different times. Also, sometimes elements can be affected in a drawing extractions or drawing views when there is not enough accuracy in the resolution design file to complete the modifications. If you start any new design files with the delivered working units you should not see this type of action again.