I presume you mean rent supplement?
As far as I know there hasn’t been any recent universal cut in rent supplement & the last one of €6 per week was in June 2009, bringing the total deduction from €18 per week up to €24 per week. In other words if the rent is €100 per week the tenant is entitled to €76.
You need to check with your tenants, as the payment is an arrangement between the HSE & your tenant, just as your lease is a contract between you & your tenant. You have no legal contract with the HSE. Your tenants are legally responsible to ensure that their rent is paid, as they are the ones who signed the lease agreement with you.
Quite a lot, if not most CWOs will not process the payment to a landlord’s bank account, but to the claimant’s (the tenant’s) account – the practice was stopped by most of them some time ago, as some landlords were incorrectly viewing it as some sort of contract between the HSE & themselves, which is not the case, so any CWOs that continue to do so are doing it on a local level & as a convenience to landlords/tenants. They are not obliged to inform the landlord of any reduction. The matter is between the HSE & the claimant (your tenant).
As rent supplement is means tested, a further reduction of €107 would suggest that your tenant’s circumstances may have changed, & their means reassessed, so you should contact them for clarification.
The HSE sets maximum rent levels for each county, so you should check the list here
http://www.welfare.ie/EN/Schemes/SupplementaryWelfareAllowance/Pages/RentSupplement.aspx to see what the level is in your area & how it may affect your tenants.