Unfortunately we've seen a lot of this and we don't know why this is happening.  However, it's an issue with the CPS Aspen.  Best to contact your school administrator or CPS IT Helpdesk:

Parent Tech Support Help Center
Monday - Friday, 7:30 am - 4:30 pm
773-417-1060
Or visit: https://chicagopsprod.service-now.com/csp