Mobs being where they shouldn't be...

I have encountered a number of instances where mobs are getting to impossible places. On the roots in Cirdas_U during delve (do shields block when the mob is above your head?) and just tonight while fighting Arch Angel EV on normal difficulty, at 10:40 PM MST she 'climbed' up the wall, and then ran off the reachable by players ledge, and then dropped through the floor. I did not think to ScreenShot this at the time because I was tanking her as pld/nin. I had to run into the middle of the BCNM area before she came back through the floor and we were able to attack her again. This took nearly a full minute due to her constantly hitting me with stun and casting things, WHILE IN THE FLOOR. I've put up with the mobs on the roots in Cirdas because there is usually a way around it, but this... is ridiculous. This needs fixed immediately.

Greetings,
While we do appreciate that you have brought our attention to the trouble you experienced, the amount of information provided is insufficient for us to conduct an investigation into the cause of the trouble and how we can resolve it. To help provide some insight into the information we find valuable for looking into and resolving these errors, you can go to the Welcome to the "In-Game Bugs" Forum! to find out what information we do need and why that information is important. There is also a template that we provide for reporting Bug Report Template. We are certainly not going to require strict adherence to the templates, but they do help show the information we find important for those reports in an easy to fill out format. As long as the information is provided, however, feel free to use the format that feels most comfortable and informative to you.

We are looking forward to getting more information from you so we can look into this error and try to resolve it. Thank you for taking the time to provide more information about this error, and for continuing to support FINAL FANTASY XI.

-Furlamseere