Two 3-way dimmers on 6 LED lights - lights blink when on
You should not use two 3-way dimmers on the same lights. A 3-way dimmer can be used in combination with a 3-way switch, to have on/off/dim at one location and on/off at the other.

But if you dim at two locations, rather than getting 0% to 100% dimming controllable from either end, you end up with a combination of the two dimmers' settings that may not make sense. The exact behavior depends on the particular electronics of the dimmers, but for LED lights and their compatible dimmers blinking is a possibility as the modulation timing of the two dimmers will not align perfectly.

Change one of the dimmers to a switch. If you must have dimming at both locations, look for a dimmer that offers a remote control option.