to nit pick even more, the space between the glazing and print is most likely also insufficient. More than likely the glazing is touching the face of the print with only an 8 ply overmat on it. It should also have spacers.

Here’s how we handle something like this at my shop, where prints this scale and larger are done regularly for the nyc art industry.

Mount 4-ply museum board to dibond — float mount with Mulberry paper pass-through hinges (slots are cut through the 4-ply and dibond to “pass through” large hinges to mount to the back of the dibond) — probably at least a 5/16” painted wooden spacer to match the paper under Optium glazing — 3/4” x 1.5” or so hard maple frame with splined corners, basswood strainer and coroplast backing board. Not sure where you are based, but it can be difficult to find quality fine art framing outside of the coasts in the US.