# Performance Calculation Errors

**URL:** <https://forums.collective2.com/t/performance-calculation-errors/2704>\
**Category:** C2\
**Created:** [September 22, 2011, 9:15pm UTC](https://forums.collective2.com/t/performance-calculation-errors/2704 "2011-09-22T21:15:54Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![EliJones](https://yyz2.discourse-cdn.com/flex028/user_avatar/forums.collective2.com/elijones/32/32_2.png) [@EliJones](https://forums.collective2.com/u/EliJones)\
**Post date:** [September 22, 2011, 9:15pm UTC](https://forums.collective2.com/t/performance-calculation-errors/2704/1 "2011-09-22T21:15:54Z")

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i am guessing this is already a known issue, but the stats on my system are reporting 5000% errors in annual return and slippage. more may be wrong too.

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**Author:** ![DeanPignon](https://yyz2.discourse-cdn.com/flex028/user_avatar/forums.collective2.com/deanpignon/32/308_2.png) [@DeanPignon](https://forums.collective2.com/u/DeanPignon)\
**Post date:** [September 23, 2011, 4:12am UTC](https://forums.collective2.com/t/performance-calculation-errors/2704/2 "2011-09-23T04:12:53Z")

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Yes I noticed also; Isonomy Plus was showing some way-off stats last night. Back to normal now.  
  
  
  
This glitch happens very occasionally. So far I have only seen it when markets have been closed. Usually it is immediately obvious that there is a glitch and that the figures are not real.