Individuals set their own price, to sell at, no need, just sell when you wish

I'm starting to suspect that the market is manipulated for each individual. I placed a sell order for $218 on Sol and at 1:00 p.m. it was always at $217.70/80 and then went down. When I made the sale for $217.80, the market instantly went up and reached $218.70. Either I'm unlucky or prices are different for each person.