How to edit tenant names for non western formats?

I have accepted tenants and we are at the contract signing stage. However, the tenants understandably want the names listed exactly as shown on their passports so the Home Office does not get picky.

However, no matter how many times I have tried, I can not get it to let me change the names. The lead tenant has tried changing her name herself without any luck. I have tried removing and adding her husband’s name but it continues to put it in only one order and removes one of the names. Very frustrating that it refuses to allow such a simple change.

Does anyone have any advice? Thanks!