why don’t my parents call me? (don’t tell me to call them first.)

why don't my parents call me? (don't tell me to call them first.)
why don’t my parents call me? (don’t tell me to call them first.)

Ask for what you want. Let them know that it means a lot to you to have them call you, and you would like them them to do so. You could even recommend a schedule (Sundays at 7 PM for example.)

They love you but are not sure if you want the calls. They trust your abilities + management.
They love you but are not sure if you want the calls. They trust your abilities + management.

Could very well be. Making it clear to them that you value their calls and welcome them could make them feel more secure about picking up the phone.