AEA 25 inches between shots, not grouping

I'm shooting at 25 yards for the first time with this gun after installing the scope, but the pellets are not grouping, there is a separation of up to 25 inches between them. Any idea what's going on?

The airgun is AEA ELEMENT regulated

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Like sb327 said, your wording can be interpreted several ways. If first time shooting brand new gun, I'd check for loose parts, possible manufacturer neglect, or screws loosened during shipping. Suspect bad scope if first time shooting, after scope change, but shot well with previous scope. If gun shot well, then sudden poor grouping, followed by a scope change to investigate, likely damage to internals resulting in clipping, not scope related. WM
 
In October 2022, new JTS Airacuda Max .25 arrived from Pyramyd Air. Cleaned barrel with PatchWorm/Ballistol, installed scope. Loud clang and accuracy, similar to yours, resulted. Later determined installer failed to tighten stack bolt down on 5-piece baffle arrangement inside shroud between muzzle and end cap. Pellet deformed, after hitting loose parts, spiraling while attempting to self-stabilize which led to zero accuracy. WM