it's *possible* (at least from what I remember having to deal with in my agency), that since GSA restricts how much should be spent "per quarter" to some percentage, they may have already obligated more than that "set" amount for the 2nd quarter (Jan - Mar) and what is currently the 3rd quarter (Apr - Jun)... but still may have money left for the rest of the FY IF they don't spend it to the degree they are obviously spending.
We used to rail about that because we ended up scrimping for much of the fiscal year (Oct - ~July) and then come the summer, we have all this money that has to be spent by September 30. Year after year after year. The vendors that focus on government business were always waiting for that summer spurt of buying. 
When stuff like that happens, Congress will usually passes some kind of "Supplemental Appropriation" over the summer to add to the funding if there was some situation that caused that higher spend.
As it is, they are all operating under a C.R. and that was generally the same amount of funding as last FY. Trying to "reprogram" that might be illegal but then they don't care about laws as they have already violated the Antideficiency and Impoundment Acts and no one seems to care, and the courts are taking their time on it. 
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