Been using LLD for a few months already to automatically create items, triggers, graphs and such on our monitored devices but we noticed a problem that we were not able to find a solution. 

 Our LLD is applied every one hour and brings several different information from the network interfaces and one of them is the operational status of the link. No matter what I change on the LLD, within the original template, none of the already created items will change (item name, update interval, etc) and this only seems to be happening in one template we are currently using.

If we go to the LLD used in our template and add a new item prototype or change one that already exists, the changes are not applied to our hosts, everything remains the way it is.

I have attached the screenshots of it (LLD-item-prototype-template shows the current update interval we are using, just for test, which 30s and the LLD-item-prototype-in-host shows the already created item after the LLD has been applied but the update interval remains in 40s).

Currently using Z 3.4.15.