Samsung S Planner not fully synching with computer google calendar

[AC Question]

Hi, I've recently started using google calendar at work and the events i create on my computer automatically get reflected onto my phone's S planner calendar. But the other way doesn't work: when I create an event on my phone, it doesn't appear on my computer. They 2 devices clearly "talk" to each other but the information only does in one direction. What should I do? Thanks for your help!

PS. I suck at IT stuff so please explain things as simply as possible! :-( Thanks!!!