Thanks, Tony. See support info below, JEV + RSVP are up to date now. But the problem is still the same. In the event translation page, both the german and english "contact" fields are blank, and both get cleared everytime after saving.
Unfortunately, I am not allowed to provide access to the backend, so I guess we are stuck here. Do you have any ideas what could be wrong, so I could try to look by myself? Thank you!
PHP Version : 7.3.10
MySQL Version : 5.5.60-0+deb8u1-log
Server Information : Linux drbd-m-35 3.16.0-5-amd64 #1 SMP Debian 3.16.51-3+deb8u1 (2018-01-08) x86_64
Fix jQuery? : Yes
Load JEvents Bootstrap CSS? : Yes
Max Input Vars ? : 1000
Club code set? : Yes
User Agent : Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:84.0) Gecko/20100101 Firefox/84.0
Joomla : 3.9.23
component_com_jevents : 3.6.12
component_com_rsvppro : 3.6.2
component_com_jce : 2.6.35
component_com_hikashop : 3.1.1
module_mod_jevents_cal : 3.6.12
module_mod_jevents_custom : 3.6.12
module_mod_jevents_filter : 3.6.12
module_mod_jevents_latest : 3.6.12
module_mod_jevents_legend : 3.6.12
module_mod_jevents_switchview : 3.6.12
layout_JEventsExtPlusLayout : 3.6.0
layout_JEventsFlatplusLayout : 3.6.0
layout_JEventsFloatLayout : 3.4.8
layout_JEventsIconicLayout : 3.6.0
layout_JEventsSmartphoneLayout : 3.4.1
plugin_actionlog_jevents : 3.6.12 (not enabled)
plugin_content_jevents : 3.6.12
plugin_finder_jevents : 3.6.12
plugin_installer_jeventsinstaller : 3.6.12 (not enabled)
plugin_jevents_jevfiles : 3.8.0
plugin_jevents_jevrsvppro : 3.6.2
plugin_rsvppro_authorizenet : 3.6.2 (not enabled)
plugin_rsvppro_manual : 3.6.2 (not enabled)
plugin_rsvppro_mollie : 3.6.2 (not enabled)
plugin_rsvppro_paypalexpress : 3.6.2 (not enabled)
plugin_rsvppro_paypalipn : 3.6.2 (not enabled)
plugin_rsvppro_quickpay : 3.4.27 (not enabled)
plugin_rsvppro_stripe : 3.6.2 (not enabled)
plugin_search_eventsearch : 3.6.12
plugin_system_gwejson : 3.6.12
plugin_system_hika_rsvp_redirect : 3.6.2 (not enabled)