Userform open with workbook issue

[DSeck]

I have created a workbook with a userform that collects data, does math, puts data into a form and prints it. I set it up to where it runs the userform when the workbook opens and that it where the issue begins. Everything opens and the macros all appear to work just like thaty should the problem is the tab function. As I tab through the entry boxes the first text box it comes to I t highlights the instructions already in it but if you try to tab past it like you have no entry to make, it actually erases the text and tabs in the text box instead of just moving to the next entry box. If I just run the userform from developer it works fine. I know I can put a button in and run the userform after I open it but that is an extra step that I shouldn't need. Any ideas as to what is happening and why. I have attached the file, with the auto print function disabled.

[DSeck]

oddly enough I opened it a couple more times and it started behaving correctly thank you for any that tried to help