Is there any possibility that you have a "shared neutral" in either switchbox? If you turn off the breaker supplying these new lights, are there any hot wires showing as hot in either switchbox? If the answer is yes, then post back. My explanation below assumes no shared neutral in either box.
To diagnose, i would suggest the following. Unhook all wires from both dimmers and from each other. Turn the breaker back on and test all wires in both switchboxes for hot. I would recommend a neon tester ro do that. Wrap a piece of yellow tape around that to indicate that it is the incoming hot. Connect that wire to the COMMON terminal of the first switch (usually a black screw) after turning the breaker off again. Now we are going to identify which cable carries the travelers. This explanation assumes that you have 14/3 wire running between the switches. At the first switch, tie the black and red wires together under a wirenut. Go to the 2nd switchbox and test between black and red wires to find the pair that shows continuity. Put those wires on the traveler terminals of switch #2. Go back to switchbox 1 and unhook the black and red from each other and put them on the traveler screws on switch 1. At that point you should have a white (that is in the same cable as the yellow taped black) and a white that is in the same cable as the red and black travelers you just identified. Tie those two white neutral wires together. At switch #2 you will have a black and white that lead to the first light. Wrap red tape around that black ( to indicate for future reference that it is the common), and hook that red taped black wire to the COMMON terminal of awotch #2. Connect the remaining two white wires in switchbox 2 together. At that point everything should work correctly.
Post back to let us know.
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