When you sign up to Glide you are provided with your weekly quote; however, Glide bills you monthly. To calculate this, Glide multiplies your weekly quote by 52 (weeks in the year) and then divides it by 12.
Your monthly payment will be for the same amount on the same day of the month, to help you with your budgeting.
Please note, you only get billed for live services. At the start of your contract, some services may transfer over at different times, so your first payment plan or two may be slightly different. Once all services have been set up, you will be billed for a whole month for all services.
Double check your payment plan for a full breakdown of what you've been billed by looking at the dates for each service.