It sounds like your cab doors are misaligned and hitting the corner of the cab over when first opened but clear as you open them further. Possible causes include:
1. Misaligned door hinges: Could be slightly out of alignment.
2. Body/frame flex: The motorhome’s body might shift, causing door fitment issues.
3. Weight distribution: Even if you don't have much stored, uneven weight could affect door clearance.
4. Binding seals or trim: Rubber seals or trim might be causing interference initially.
To resolve, check the door alignment, inspect for any binding seals or obstructions, and ensure the weight inside the vehicle is evenly distributed. If the issue persists, have an RV technician take a look.