unsure about a car problem?

[angel]

I have a 1995 oldsmobile 88. Recently i have been having problems with my resiviour holding antifreeze. We just had to replace an elbow that goes from the pump to the block because it broke. Well since then i have been noticing that my car isnt hold antifreeze in the resiviour. Yesterday at work i noticed that there was NO antifreeze in the resiviour but the radiator was full. I did notice a puddle when i got home. i have a gravel driveway so its easy to see. Well we took a look at it and had it pressure tested. holds great pressure, no white smoke, doesnt over heat and it wasnt dripping anymore. We assume that it burped from the change of the elbow and the antifreeze was from just excess that sat on the block from when we took the water pump off. last night it wasnt leaking anymore so i drove home. This morning i checked it and had another puddle under the car, but i only lost about an inch in the resiviour. and the serp belt was a little a little wet. the radiator is full. i have a feeling that theres something we're missing, I dont know. Am i overthinking it or is there a possibility theres more wrong....... Im going to check it a little later and see. o and things seem pretty dry under there but its been sitting all night. better to be safe than sorry