1876 Resources is a different operator. They are supposed to send a Division Order to every mineral owner that is due royalties within a certain spacing unit for every well that applies. The spacing unit can contain several wells.
In some states you must sign the Division Order to get paid. Other states, no.
CO does not require that you sign, but you need to send back a W-9 so that proper withholding is accounted for. You need to check the decimal amount on the division order to make sure that it matches your net acres, your royalty and which wells are accounted for. Statue 34-60-118 states that the Division Order cannot change the terms of the lease, so chase down your lease and make sure everything matches.