Logback messages are getting mixed up in multithreaded dropwizard service scenario - logback

Question

We have a multithreaded service where some individual log messages are getting corrupted when another thread writes to the log at the same time. How can I prevent this from happening?
We are using worker threads to make REST service calls, receive, and process a response. While doing so, we write to the log, using logback, the default logging engine in dropwizard.
specific case that I'm looking at is when a thread throws an exception, we log the stack trace. What I see is that the trace is cut in half by entries from at least one other thread:
Example
[pool-4-thread-13] Error!
stack trace line 1
[pool-4-thread-17] Event 1 happened
[pool-4-thread-17] Event 2 happened
stack trace line 2
stack trace line 3
stack trace line 4
What I expected to see in the log was something like this:
[pool-4-thread-13] Error!
stack trace line 1
stack trace line 2
stack trace line 3
stack trace line 4
[pool-4-thread-17] Event 1 happened
[pool-4-thread-17] Event 2 happened
config.yaml
server:
adminContextPath: /admin
adminConnectors:
- type: http
port: 9193
applicationContextPath: /
applicationConnectors:
- type: http
port: 9192
maxRequestHeaderSize: 64KiB
requestLog:
timeZone: UTC
appenders:
- type: file
currentLogFilename: ./logs/service-requests.log
archive: true
# When the log file rotates, the archived log will be renamed to this and gzipped. The
# %d is replaced with the previous day (yyyy-MM-dd). Custom rolling windows can be created
# by passing a SimpleDateFormat-compatible format as an argument: "%d{yyyy-MM-dd-hh}".
archivedLogFilenamePattern: ./logs/service-requests.log.%d.log.gz
# The number of archived files to keep.
archivedFileCount: 30
logging:
level: INFO
loggers:
# We only care about warning log messages from the apache libraries, like hadoop, zookeeper, and phoenix
org.apache: WARN
appenders:
- type: file
timeZone: UTC
currentLogFilename: ./logs/service-log.log
archive: true
archivedFileCount: 30
archivedLogFilenamePattern: ./logs/service-log-%d.log.gz
logFormat: "[%date{dd MMM yyyy HH:mm:ss}] [%thread] %-5level %logger - %message %n"