StarAlignment causing black horizontal stripes on some subs

[gaiors]

Dear friends, i am new to PixInsight and most likely i am doing something wrong, i did some deep search on google and could not find any similar issue.
As you can see in the attachment, on the right is the calibrated sub, looking good, and on the left is the same sub after StarAlignment, some strange black band appeared. Not all subs have this behavior. My camera is a Canon T2i/550D. The StarAlignment settings were the standards of PI.
Any one had this same problem before? Your help would be much appreciated! Thank you!

[rdryfoos]

Do you have another camera?  does that one work with star alignment OK?  Is this the first time this has happened with this camera (lots of questions).  How many subs are you aligning?  Do they all look like that?  Which sub are you using as a reference image?  Could it be that there is an issue with the reference image?  If not--make sure you have the proper boxes checked--there are some options that are used for making mosaics and things like that that you do not want to use (there are allot of options).  I don't use a OSC so I know nothing about debayering, but could the issue be related to that?  Did you check the  box in BPP for OSC cameras?

Can't think of anything else---sorry

[gaiors]

Do you have another camera?  does that one work with star alignment OK?  Is this the first time this has happened with this camera (lots of questions).  How many subs are you aligning?  Do they all look like that?  Which sub are you using as a reference image?  Could it be that there is an issue with the reference image?  If not--make sure you have the proper boxes checked--there are some options that are used for making mosaics and things like that that you do not want to use (there are allot of options).  I don't use a OSC so I know nothing about debayering, but could the issue be related to that?  Did you check the  box in BPP for OSC cameras?

Can't think of anything else---sorry

Thanks for your reply
This is my only camera at the moment, i am aligning 44 subs and this hapens with aprox. 20% of them. Im using one of the raw .CR2 uncalibrated images as my reference frame. I am not sure what you mean by OSC camera and BPP, can you please clarify? Thank you!