May-Thurner syndrome (MTS) is a condition where the left common iliac vein is compressed by the overlying right common iliac artery. This leads to stasis of blood, which predisposes to the formation of blood clots. Uncommon variations of MTS have been described, such as the right common iliac vein getting compressed by the right common iliac artery.
As your situation is atypical/complex, I think you should see your doctor for further workup and/or management.