MinnowBooster SP Delegations Larger Than Expected??

Question.....

When I click on the "Fill This Offer" button on the New Lease Requests in MinnowBooster, it seems lately that the amount in SteemConnect is double or triple the amount of the original request. What am I missing???

Here is an example:

#1. I see this request for 145SP and I click on it.



#2. I'm taken to the next page where I fill in my Steem ID and choose execute the transaction through SteemConnect (still good so far)



#3. THIS is where it happens, all of the sudden I'm asked if I'm ready to delegate 450SP!??!



Yikes!!! What just happened???

I usually back out at this point because I'm not wanting to commit 450SP for the price of 145SP.

Can anyone tell me what's going on???

Thanks!