I have had this issue on-and-off for a while now. When I create new lists I often go back to find them and discover they have disappeared.
Can someone please tell me why this is happening?
I just tested it by adding five new lists and they all disappeared a few minutes later when I returned to the application. This is on the Mac desktop app.
Hi @ToastedSandwich , thanks for using GoodTask.
Are you referring to Reminders list? Do you use Reminders with iCloud? Please share some details. You can send screenshots or screen recordings to contact@hahaint.com Thanks!
Hi there,
Yes, I am referring to reminders lists and I use reminders with iCloud for the syncing feature.
Cheers
Would you try restarting the device and see how it goes? Also check if Reminders app is working properly. Thanks!
Hi there,
I tried adding projects to Reminders directly and they too disappeared from there. I have additional iCloud storage so I don't expect I am running out of space. Is there a limit to how many lists I can have?
As far as I know, I don't think there is a limit on the number of lists. You may want to troubleshoot your iCloud Reminders status with Apple.
I recommend trying it on other devices or iCloud.com webpage and see if it works or not. If it works, you may want to reconnect on the device that's not working properly. (Settings > iCloud > Reminders turn off and on)
If it doesn't work in all the area, you need to get help from Apple.
Thanks!
I did what you suggested and turned off Reminders in iCloud then turned it back on and now a lot of old reminders have appeared!
I have lost all my current reminders. Help!
I recommend contacting Apple directly for further support. I hope you get things organized back again. Thanks!
Unfortunately they could not restore my lists so I have lost 700 items 
Does GoodTask keep a JSON file or CSV or something similar of all tasks? There is a folder of random stuff in a GoodTask folder on iCloud drive.
No, unfortunately it doesn’t keep the data that can be used elsewhere. I’m sorry about your loss. 