Problem in developing Fomapan 100 classic

[amellice]

First time developing semi-stand in Rodinal. 1 hour with agitation first 1 min and then 2 agitation every 15 mins, I don't think the problem is related to that though but I could be wrong. All shots have this thick black line in them except for the very first shot as you can see in the second image.

Edit: more details
camera is Mamiya RZ67PROII, and the back is 6x6 that I just got from eBay.

Thanks for your help

 

[Xmas]

First time developing semi-stand in Rodinal. 1 hour with agitation first 1 min and then 2 agitation every 15 mins, I don't think the problem is related to that though but I could be wrong. All shots have this thick black line in them except for the very first shot as you can see in the second image.

Thanks for your help

Could easily be your camera.

 

[Zathras]

First time developing semi-stand in Rodinal. 1 hour with agitation first 1 min and then 2 agitation every 15 mins, I don't think the problem is related to that though but I could be wrong. All shots have this thick black line in them except for the very first shot as you can see in the second image.

Thanks for your help

I'd say you have a light leak. It looks like the film was not wound tightly enough on the take up spool when it came out of the camera, or it loosened up somehow before you taped it. You may want to check that the film wind is working properly in your camers.

 

[Ricardo Miranda]

And the culprit is...
"Light Leaks" by Amellice.
Congratulations!
Now, you can make that speech.

 

[Ricardo Miranda]

P.S. The fault is probably when you took out the roll or your back has a light leak.

 

[amellice]

Thanks for the help guys, I shot other rolls in the same back but not yet developed, hopefully won't see this ugly light leak in them

 

[amellice]

just developed another roll and the same black line appear, I think it's a problem in the back because other backs don't have this problem, how to double check if the problem is in the back and how to fix it?

 

[Xmas]

just developed another roll and the same black line appear, I think it's a problem in the back because other backs don't have this problem, how to double check if the problem is in the back and how to fix it?

Compare backs.
Note how you use the dark slide.