After inserting the Flip Book block, the edit mode does not work anymore

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After I have added the PDF Flip Book as a block on my page (www.k-advice.de), I cannot select the other blocks in edit mode. As soon as I reset to my old version, where the Flip Book block is not inserted, everything works.
How can I work around this?

Type: Pre-Sale
Status: New
wundalaadmin
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concrete5 Environment Information

# concrete5 Version
Core Version - 8.5.7
Version Installed - 8.5.7
Database Version - 20210623000000

# Database Information
Version: 5.7.35-38-log
SQL Mode: NO_ENGINE_SUBSTITUTION

# concrete5 Packages
Cookies Notice (1.3.2), Customize Editing Interface (1.0.1), ExchangeCore reCAPTCHA (1.1.1), Honest Websites Back To Top (1.1.0), Instant Page Speed Magic (1.1.5), Lazy Menu (1.0), Parallax Slider (1.1.7), PDF Flipping Book (1.0.3), Pixel Theme (2.1.0), Spacer (0.9.4), Supermint Theme (3.4.1.3)

# concrete5 Overrides
None

# concrete5 Cache Settings
Block Cache - On
Overrides Cache - On
Full Page Caching - On - If blocks on the particular page allow it.
Full Page Cache Lifetime - Every 6 hours (default setting).

# Server Software
Apache

# Server API
apache2handler

# PHP Version
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# PHP Settings
max_execution_time - 30
log_errors_max_len - 1024
max_file_uploads - 50
max_input_nesting_level - 64
max_input_time - 60
max_input_vars - 1000
memory_limit - 256M
post_max_size - 32M
upload_max_filesize - 32M
ic24.api.max_timeout - 7
ldap.max_links - Unlimited
mbstring.regex_retry_limit - 1000000
mbstring.regex_stack_limit - 100000
mysqli.max_links - 50
mysqli.max_persistent - Unlimited
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session.cache_limiter - <i>no value</i>
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