UK based Three Drops Press has posted an anthology call for "White Noise & Ouija Boards: An Anthology of Ghosts & Hauntings". They're looking for poetry and flash fiction up to 1000 words. Reprints are okay. The deadline is May 26, 2017 and payment is a royalty split. You can find the details here.
Via the blog of Eric Nash where you find a few more submission calls for horror anthologies.