Question Bug when i change SUBJECT for answer in the topic

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Kunena menu details:

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ID	Name	Menutype	Link	Path	In trash
570	Форум	kunenamenu	view=home&defaultmenu=572	forum	No
571	Начало	kunenamenu	view=category&layout=list&catid=0	forum/index	No
572	Последнее	kunenamenu	view=topics&mode=replies	forum/recent	No
573	Создать	kunenamenu	view=topic&layout=create	forum/newtopic	No
574	Без ответов	kunenamenu	view=topics&mode=noreplies	forum/noreplies	No
575	Мои темы	kunenamenu	view=topics&layout=user&mode=default	forum/mylatest	No
576	Профиль	kunenamenu	view=user	forum/profile	No
577	Помощь	kunenamenu	view=misc	forum/help	Yes
578	Поиск	kunenamenu	view=search	forum/search	No

Joomla default template details : lt_inclean | author: LTHEME.com | version: 1.0 | creationdate: May 2018

Kunena default template details : NTS KBento | author: Nice Theme Store | version: 5.2.7 | creationdate: 2019-05-03

Kunena template params:

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DefaultCategoryicon	fa fa-folder
profileIconset	default
editorIconset	default
lightboxColor	white
borderless	1
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displayFooter	1
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formRecover	1
labels	0
whoisonlineName	default
avatarType	img-rounded
topicicontype	fa
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socialtheme	classic
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localstorage	0
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forumLinkColorHover	#006699
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templatebyText
templatebyName
templatebyLink
wysibb	bold,italic,underline,strike,justifycenter,img,video,bullist,numlist,fontcolor,fontsize,fontfamily,removeFormat

Kunena version detailed: Kunena 5.1.12.1 | 2019-04-22 [ Kerberos ]
| Kunena detailed configuration:

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Kunena config settings:
board_offline	0
enablerss	1
threads_per_page	20
messages_per_page	50
messages_per_page_search	15
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recaptcha_publickey	6LcV6PoSAAAAAHYbzF8l718_CxFo5Q8WZeLpvsXv
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recaptcha_theme	white
keywords	0
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credits	0
userlist_name	1
usernamechange	0
version_check	1

| Kunena integration settings:

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Kunena - Finder Disabled
Kunena - AltaUserPoints Disabled
Kunena - Community Builder Disabled
Kunena - Easyblog Disabled
Kunena - Easyprofile Disabled
Kunena - Easysocial Disabled
Kunena - Gravatar Disabled
Kunena - JomSocial Disabled
Kunena - Joomla Enabled: access=1 login=1
Kunena - Kunena Enabled: avatar=1 profile=1
Kunena - UddeIM Disabled

| Joomla! detailed language files installed:

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Joomla! languages installed:
ru-RU	Russian
en-GB	English (en-GB)

Third-party components: None

Third-party SEF components: None

Plugins: None

Modules: None