Of course you are right!!!
I am still totally lost with these cache plugins – when I used Wc3 cache it slowed down my site enormously so I use another: wp fastest cache. Do we really need a cache plugin??? Tell me what you think.
Thank you anyway for the suggestion. I should think about that but seems that I think the wrong way – I think that when I clean the cache plugin it should refresh but seems that it is doing the contrary…