After-trade: Items not showing up on buyer's inventory

[Roble_Viejo]

I encountered this problem 3 times today: I sell them the item (only sold mods today), the trade ends successfully, I get the plat and they tell me they don't have it, they check the direct link in the chat and they don't get the "1 Owned" description on the top left, neither they can see the item in their inventory. This is fixed after a couple of minutes, but that's enough time to someone to think Im scamming them and report me, reason why I'm not trading anymore until this is fixed. 

I'm from Argentina so my connection is always laggy, but even above 600ms the items ALWAYS showed up in time, I have NEVER experienced this before. I'm very much worried about someone thinking Im scamming them and reporting me. 

For the record, Im MR25, +3000hs of gameplay on Steam and I have NEVER EVER have this happen before. Even with over 600ms of latency.