Q: wadden island neap tide at Northsea side regular at wadden side?

hi all. A regular visitor (and childhood inhabitant) to the wadden isles all my life I never fully grasped the tide dynamics around it. There used to be tide tables only for one location on the island with rules of thumb like subtract x minutes for location y but that was all that was easily available. This year I (re)discovered the Apple Watch tides app which offers a few more locations on the island and i enjoy cross referencing my own observations to the apps data, finally really grasping wantide/tidal meeting point etc.

Today we have neap tide at the North sea according to the app. But the apps wadden sea side location shows a regular tide. How does this work? Or is the apps data wrong for this location (apparently it aggregates data from multiple not fully disclosed sources)?

Add: checked the tide for a waddensea harbour on the mainland ( for which I assume the data will be sound) and it also has no notable spring/neap pattern so I assume it is really the case that these are far less uitspoken in the waddensea compared to North sea but I’d love an explanation of why that is.