"may be causing" is correct and commonly used in written English.
It is used to indicate a possibility or potential cause of something. Example: The heavy rain may be causing the flooding in the streets.
I was astounded that these may be causing some problems.
Sorry for any inconvenience this may be causing.
Apologies for any inconvenience this may be causing.
WHAT, according to this article, may be causing the unrest?
Now some of that activity may be causing separation.
PALTRY recent returns may be causing many American investors to lose enthusiasm for the stock market.
Light pollution may be causing decline – bats, for instance, learn to hunt moths by street light.
The procedure is meant to flush out whatever particle may be causing the swelling.
Many scientists say that the emissions may be causing the earth's atmosphere to become warmer.
It would also assess ways in which sharia law may be causing harm in communities.
No regulations exist to govern species that may be causing lasting damage to forests and meadows.
