@MitchBu
Hi Mitch,
DonManfred is right - it is difficult to assess with little information and I know that apps can become "trade" secrets and complex and large. But that said and left there, may I ask some questions ?
1. You say that it works well on the phone but not on the tablet ? (1st Clue)
2. Do you use designer to design your screens with Anchors or not ?
3. How many derivatives do you have in your designer ? (1 for your phone and 1 for your tablet maybe ?)
4. Have you opened the "tablet" derivative to check your design ?
You see, with what I have to go on, and from my past experience, In designer, when you create a screen (the phone screen for example) and use your anchors correctly and then decided to create a new derivative to work on a tablet, then the copy is almost always perfect to the new derivative. However, when you return to your 1st screen (the phone screen) and now add a new item or change any element, THIS DOES NOT REFLECT on the second screen (tablet screen) and you need to place and re-align the element there correctly again.
My guess this is what has happened to you, but then again I could be a dog and I could be barking at a pseudo cat in the wrong tree !!
Good Luck !!