direct links of trade site often become outdated within 1 or a few seconds

Hi,

when i search for items often direct links becomes outdated within few seconds.
https://www.pathofexile.com/trade/search/Necropolis/....
Last league they lasted for i guess 3 min atleast.
It is really inconvinient when you scroll for 1 second and then all the direct links become outdated. And when you hover over it says "item must be refreshed". Refreshing trade site doesnt help. It repeats the same way even after refreshing trade site.

Please fix it.

And: What is the reason for that problem?