1. I came to a site by pc but do nothing, then later I go to that site again but using my mobile and buy 2 shirts.
Google Consider it seperate things as far as i know means (Tablets , Mobile and Desktop) have seperate conversions.As you directly go through URL in mobile then
I dont think Google...
Converted Click = Actual Conversion Take Place With Specific Click (converted clicks -> same goes for others click)
Conversions = May be User Buy More items and more transactions through 1 (Converted click)
1 - Your site must have contact info, about us and few other standard pages
2 - Is it your product or affliate becoz adword dont like affliate sites
3 - Use original content if possible
4 - Once you will made changes tell ad word support by just chat (They have nice support) or call them !