Here's another thing I spotted - I was taking some shots indoors of family but also facing a bright window partially covered by vertical blinds.
On reviewing the shots later on my computer I noticed some weird "ghosting" of what I assume were the bright gaps between blinds, layered on top of the subject - ie my partner and her baby niece.

Is this sort of thing typical with this lens, and if so, what can be done to limit it from happening again?