I was wondering if there are or could be any issues in mixing wvo that has been picked up from different sources like different types of oil possibly ?

Yeppers,

It is not a problem to mix oil from different sources. I have been mixing a high titrated (5.5) partially hydrogenated soy oil with a lower titrated (1.5) canola oil for a little while with no problems. It just helps lower the overall titration to about (2.25) You may want to keep track of what you are mixing and stay away from the hydrogenated types when the temperature starts dropping ;-)