Removal of air rifle ad

I have advertised an air rifle for sale. But on certain occasions they allow it and other time they remove it. As soon as I use the word carbine it will get published but if I use the word air rifle it gets removed,there are others advertising the same product and there's don't get removed. To whom it may concern and those who read the ad's before making a decision,do your homework on the product before just removing it. An air rifle does not need a license in south Africa,it can be sold and bought at any store selling these products without a license. Very disappointed in the way Gumtree handles ad's and I would recommend anyone thinking of placing an ad on Gumtree to look for other options like junk mail etc.