Hi @HTWGkonstanz

Thanks for the report, this is surprising indeed: it should be the same, because both views should use the same API and data source.

Can you reproduce this issue on https://demo.piwik.org ? please paste the links and we will investigate

Yes, I can replicate the bug – but the differences between the numbers are much smaller (differences of 10 views etc.)

For example:
Pages
In year 2015 the page „index“ has 36.203 page views.
If you open “Transitions” for this pages, it shows 36.185 page views.

https://demo.piwik.org/index.php?module=CoreHome https://demo.piwik.org/index.php?module=CoreHome&action=index&idSite=7&period=year&date=2015-11-26#?module=Actions&action=menuGetPageUrls&idSite=7&period=year&date=2015-11-26 &action=index&idSite=7&period=year&date=2015-11-26#?module=Actions&action=menuGetPageUrls&idSite=7&period=year&date=2015-11-26

On our website we had much more “extreme” differences, where one number was only 50% of the other number.

Guess we need to have a closer look at the way the transitions are calculating their data.
It seems to be calculated on the given URL. Which might not always be correct.

Btw. it is also possible to display data for invalid URLs. I guess there shouldn't be data at all, but instead some strange data is displayed.... See https://demo.piwik.org/index.php?module=CoreHome&action=index&idSite=7&period=year&date=2015-11-26#?module=Actions&action=menuGetPageUrls&idSite=7&period=year&date=2015-11-26&popover=RowAction$3ATransitions$3Aurl$3A$2FinvalidUr12345

Is anyone caring about this in 2017? :) I confirmed that current 3.0 demo on piwik.org also has this issue. It's enough to run transitions on monthly data "index" page.

I've checked this one on large dataset and discrepancies still occurs.

After short investigation, I've some suspicions that it might be related to how unique visitors are calculated.

Report I've been investigating: "Pages Following a Site Search"

hi ;) I want to confirm that this bug is still occurring. Are you planning to fix it?

@rogogon It's currently not planned to work on this issue. A Pull Request would be very welcome. Or if you would like to sponsor this fix/change feel free to contact the Piwik team. Otherwise it might take some time.