With JPG lending, you can make multiple offers from multiple collections, all utilizing the same offer pool! To see more on offer pools, click here.
Say you have 1400 ADA in my lending pool. With the same 1400 ADA, you can make three 500 ADA offers for Omen, two 700 ADA offers for Spacebudz, and three 650 ADA offers for Clay Nation! The first offer accepted will be taken from your lending pool until you don't have enough ADA to lend.
The warning below indicates this:
This means that once one of the 1300 ADA offers is accepted, no other offers can be accepted until you add more ADA to your offer pool.