Paper stretching while wet on wet printing

[xspillai]

Dear All,

I have a problem in the Adast Dominant 725C. I find that lately, the paper stretches while printing in two colors making the alignment of registration markers extremely difficult.

Is this the fault of the paper, roller pressure or too much water ratio?

Any suggestions?

 

[RichardK]

What's the grain direction, short or long? Sounds like short grain if you've issue between colours.

 

[xspillai]

What's the grain direction, short or long? Sounds like short grain if you've issue between colours.

The problem occurs during rainy weather when the air is moist. Can this be the reason? Art paper is affected and not Map Litho paper. Any solutions?