Does the tag read well on your Android phone? Can you read the full memory content using TagInfo app and post here? Maybe the NDEF data is segmented in a way that gives the iPhone trouble? The problem with Android apps is that the apps don’t actually write the data to the tag… they pass it off to the NDEF library in Android and that library will just take an existing NDEF message and slam records into it… so instead of just overwriting the whole thing with a fresh NDEF message and records, it will “update” the message and record data… if the original message has some quirky shit in it, it’s likely that the Android NDEF library will keep the quirks during its update.
It’s a real long shot but worth looking at the actual data on your tag before we speculate any further.