I am working on fixing the issue with old bluprints not getting set up right. Should have that fixed soon. I am also changing language and adding descriptions to the disable combinator settings that I hope will clear up most all of the confustion.
There is a lot of confusion around all of this and most of it seems to stem from a misunderstanding on how LTN works. LTN does NOT have Provider and Requester stations. It just doesn't. All LTN stations are simultaneously capble of requesting and providing items. The only way to force a station not request or provide is to have a request or provide threshold higher than you can ever have on hand or have room for. That is the mechanism LTN Combinator uses to make a station a "Provider" or "Requester" station. This can ONLY be done if the combinator is ON. If the combinator is OFF, no signals are sent to the station, so it uses the LTN default and makes it both a Provider and a Requester. In most every situation you DO NOT want the LTN Combinator to be OFF.
If you have a requester station that has 100,000 Copper Ore on hand and you turn the LTN Combinator OFF, this station now becomes a Copper Ore provider. The only thing keeping it from advertizing it has 100,000 available to provide is either a high provide threshold, or a negative Copper Ore signal from the LTN combinator to counter the positive Copper Ore signal coming in from the storage containers. If you turn the LTN Combinator OFF, it will advertize Copper Ore available if it is over the LTN configured threshold which is 1000 by default.
You DO NOT want your combinator turned off.