Fused panorama shows bright lines

Hello,

In encountered this problem everytime I wanted to create HDR (enfuse) panoramas. Normally I create big panoramas (100-200 shots). The example (see attachment and don't mind the stitching errors ;)) is a cutout of a panorama with 3 different exposures for each image (alltogether 414 images, tripod used). The brigther lines are, as far as I can see, at the crossover between the different rows. Strangely there are no vertical lines visible.

I could check if this lines occure in multirow panoramas in general or if they appear du to the amount of images or what ever you want me to test. I could even fuse the images before stitching, but then I wouldn't use this cool feature of hugin.

Best regards,

T-Lo