Light leaks?

Long time lurker, first time poster. Not even sure if its the done thing here, feel free to delete.

Never really seen such uniform banding like this. I originally thought it was shutter misalignment or cap shutter till I realised it is a vertical shutter.

https://preview.redd.it/umwejbjkrf0g1.jpg?width=2048&format=pjpg&auto=webp&s=347f1ea76a95f257cd822c7b948c196b2fab8536

https://preview.redd.it/8gvs8rjkrf0g1.jpg?width=1365&format=pjpg&auto=webp&s=3d46ca68a75a497e769f4416336821562fceae9c

https://preview.redd.it/qb47odjkrf0g1.jpg?width=1374&format=pjpg&auto=webp&s=a0be2d614012d5062f0f78f6e2e9ab7de2628b69

Contax 139q CJZ Distagon t* 35 f2.8 Tmax u/800 ID11 1:1 - digitized with an old xt1 and sigma 90 f2.8 1:2 f mount - excuse the minimal editing and water stains - yes I know how to fix all of this...