Files in Film Strip different orientation to main image....?

Just in the last couple of weeks - possibly since a recent update, I'm not sure - I'm finding that, after changing the orientation of images in the Film Strip, while they appear correctly oriented in the main image area, they do not necessarily so in the Film Strip.

For example, I can have two identical shots that both appear correctly in the main image area, while having a different orientation in the Film Strip.

Anyone else experience this?

I'm Windows 10.

Thanks.

D.